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The Cometic copper base gasket is a .063 in copper replacement specified for 1966–1984 Shovelhead bases with a 4.015 in ID. Its design requires less clamp load and conforms load distribution across the sealing area to reduce bore distortion. That focus on even sealing helps maintain reliable combustion sealing in older-style V‑twin engines while avoiding extra sealant or repeated torque procedures.
Cometic 66-84 Shovel 3 13/16in Base Gas .063inCopper, No Drains,4.015Id
